[Bug 71267] sna: (Haswell) X-server freezes when enabling DP at docking station

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71267

--- Comment #135 from Theodore Ts'o <tytso at mit.edu> ---
Jani, for the record, I did my tests with your two patches before I updated the
dock firmware, and it definitely did make the hangs go away --- and as I
mentioned, I was even able to connect to an external Dell LCD panel using DP
without any problems (although the "too many retries" debug message did
trigger).

Many thanks for working on this issue, and I agree that the kernel should not
be hanging even if the dock is buggy.   I have two Ultradocks (one at work and
one at home) --- would it be helpful if I keep one unupgraded for now?   From
looking at the intel-gfx list it sounds like you are planning on changing the
infrastructure to use some new infrastructure in the next kernel version or
two?  If you'd like me to do some testing of the new code with a buggy dock,
I'm happy to keep one of my docks at the old firmware version, especially since
the two patches seem to be an adequate workaround.

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